For us "cheap" WC owners, for now, I took my stock exhaust off, removed the rear cover(5 bolts), also removed the triangle plate(3 bolts) under the rear cover, then took a long pry bar and beat holes thru the inside walls(the exhaust has 3 internal pipes with 2 metal walls) until I could basically see all the way thru. The triangle plate under the back cover, I drilled a 2" hole thru the center of it, then took 1 3/4" pipe and sized it up with the existing exhaust tip and welded in place. You'll have to drill a 2" hole thru the rear cover also to let the new 1 3/4" pipe fit thru. At this point, you'll have to exhaust tips instead of the existing one. Re-installed the triangle plate and the rear cover. I fired the unit up, it sounds like a freakin' 1970 Chevelle--LOUD!!! This was my option until HMF develops their system for the WC. Ride Wild!!!!!